Deletion of the C-terminal DAD modifies FRL2.FH2 activity in
vivo. A, as in Fig.
2, expression of FRL2.FH2 induces thick stress fibers, actin
aggregates, and peripheral F-actin accumulation (97%, n = 100).
B, FRL2.FH2.986 behaves similarly to FH2 (99%, n = 100).
C, FRL2.FH2.965 induces fewer actin aggregates and peripheral F-actin
(88%, n=100). D, FRL2.FH2.2+3 behaves similarly to
FRL2.FH2(98%, n = 100). E, deletion of both distal and
proximal DAD motifs does not affect FRL2.FH2-induced SRF reporter gene
activation. Inset, relative levels of expression of FRL2.FH2,
FRL2.FH2.986, FRL2.FH2.965, and FRL2.FH2.2+3, as determined by immunoblotting.
Reporter gene activity was standardized to activation induced by expression of
an SRF-VP16 control fusion protein. Error bars, S.E., n = 3.
F, schematic of FRL2.FH2 derivatives.